Windows 10 Mobile has embedded in the phone call page the feature to possibly record it (or a part of it): in the past I heard that this feature would be available only in some countries, like US, where the law is not so concerned about privacy and so not in Italy. On the contrary this feature is already available also in my new Windows 10 Mobile Lumia 950 😉
As far as I know, other OS have apps that allows to do that but it is not an embedded feature and you have to run by hand that app in background before starting the call.

So, let we describe the few simple steps needed to record a phone call, function very useful, for example, when the other party is telling you something that you want to annotate. Note that I have this feature in my Lumia 950 (build 10586.29) and not in my Lumia 920, updated to Windows 10 Mobile as an Insider (build 10586.36) … and this is a little strange!

First of all, only the first time,  you have to set the appropriate application that the OS must use to do the recording (e.g. the embedded Voice recorder – IT: Registratore vocale). Go to Settings -> System -> Phone [IT: Impostazioni->Sistema->Telefono] and then, at the bottom of the page, select in the combo the app you want to use for the recording: by default no app is selected in that combo and so the recording button is not shown during a call. Note that you will find listed in that combo all the installed apps that register themselves in the OS as able to provide the recording feature (e.g. Call recorder [IT Registratore vocale]).

Choose the appropriate app that does the recording

Between the lines, clicking the Apps selection [IT: Scegli le app] link that follows (at the very end of the page), allows you to select both the app able to filter and block undesired calls (e.g. IT: Blocca e filtra) and the other one you want to get each calling number (possibly none).

Further call options

Selecting a recording app let the Record [IT: Registra] button be visible during a call, among the others (e.g. Mute, Speakerphone, Keyboard, Video Skype): when clicked once, the recording starts and the button change color. You can stop the recording during the call, clicking again that button (its will become again with no color) or it will end automatically ending the call itself.

Record button (off)

Record button (on)

The first time you use the recording function, the following alert page will appear to you and you have to click the Record [IT: Registra] button to confirm again your will: if you check the Do not display that message again [IT: Non visualizzare più questo messaggio] checkbox, this boring page won’t be displayed anymore and next recordings will starts immediately. This page simple inform you that, for legal and privacy reasons, you should have the consent of the other party to start a recording.

Alert and needed agreement

Then, once ended a recording call, where I can find it? Actually the procedure is not so obvious!!
The first think you should try is to open the app you choose to make the record (e.g. Voice recorder – IT: Registratore vocale) … as I did: but you won’t find any new recording file listed in it.

No recording available from the choosen recorder app (e.g. Voice recorder – IT: Registratore vocale)

You must run the embedded File explorer [IT: Esplora file] app and you will see in the device memory a folder called Recorded Calls. Note that you find the same not translated folder name even in the Italian OS version … even though the other default folders (e.g. Music, Rings tones, Documents) are translated in Italian (e.g. Musica, Suonerie, Documenti): possibly that this feature is still in a beta version and very probably it will be improved in the near future.

If you go inside that Recorded Calls folder you will see the file list of all the recorded calls named with the Surname, Name of the party and an incremental number: the date of the call is visible, but not the hour. If you click on one of that audio files, the default audio app Grove [IT: Groove Musica] will play it.

File Explorer -> Recorded Calls

Recorded call files